6100 ADCCP Programming Manual

(70) CHANGELIST
Requests and Responses
069225 Tandem Computers Incorporated 6–35
(70) CHANGELIST The CHANGELIST request and response are used to change the condition of stations
on a link.
Request The CHANGELIST request changes information about one or more stations on the
link. It indicates whether each station should now be active or in NOPOLL, RNR, or
ERRORSTOP condition. (For information on each condition, see “Station States and
Transitions” in Section 2, “ADCCP Link and Station Management.”)
You use this request to temporarily disable a station, or to return a station to activity.
You can put a station in any condition. For example, you can put it in NOPOLL. If
ADCCP makes a station inactive because of a serious error, you probably should not
make it active again until after you have solved the problem.
The request buffer format is:
Function := 70
Modifier := 0
Request ID := A unique value from 1 to 32767,
determined by the application
Text Out := Number of stations to change
multiplied by 2
Text In := 0
Text := For each station you want to change:
Station ID :Byte
Use the number assigned to the
station in the DEFINELIST
request. If the mode is NRM,
valid values are from 1
through 255. If the mode is ARM
or ABM, the value is 1. Use 0 to
indicate all stations.
Condition :Byte
0 = Active station
1 = NOPOLL
2 = RNR
4 = ERRORSTOP
Response The CHANGELIST response is the expected answer to the CHANGELIST request.
It indicates whether the station list has been successfully updated. If the response
status is not 0, probably no changes have been made in the station list.
For a list of status codes and their definitions, see “Status Code Definitions” at the end
of this section.